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Related Experiment Video

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A [C₁ + C₂] route to propargylidyne complexes.

Anthony F Hill¹, Richard A Manzano

¹Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia. a.hill@anu.edu.au.

Dalton Transactions (Cambridge, England : 2003)

|April 25, 2019

Summary

New tungsten propargylidynes and complex poly-tungsten-gold structures were synthesized using terminal alkynes and organometallic precursors. These reactions expand the scope of organotungsten chemistry and metal-alkyne couplings.

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Area of Science:

Organometallic Chemistry
Tungsten Chemistry
Alkyne Chemistry

Background:

Tungsten carbynes are versatile building blocks in organometallic synthesis.
Palladium and copper catalysis are widely used for alkyne functionalization.

Purpose of the Study:

To synthesize novel tungsten-containing propargylidynes and poly-metallic complexes.
To explore the reactivity of a tungsten-alkynyl bromide precursor with various alkynes and organometallic reagents.

Main Methods:

Reaction of [W(CBr)(CO)2(Tp*)] with terminal alkynes under palladium/copper catalysis.
Synthesis of ditungsten and tetrametallic complexes via alkyne coupling and reaction with gold complexes.

Main Results:

Formation of new propargylidynes [W(C-C≡CR)(CO)2(Tp*)] with diverse R groups.
Synthesis of a ditungstaoctatetrayne and a tetrametallic tungsten-gold complex.

Conclusions:

The tungsten alkynyl bromide precursor is a versatile synthon for constructing complex organotungsten and polymetallic architectures.
The study demonstrates efficient methods for incorporating diverse organic fragments and multiple metal centers into tungsten frameworks.